Furnace combustion chamber



FIG. 1 is a front perspective view of a furnace combustion chamber showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a side elevational view thereof; and

FIG. 7 is a side elevational view thereof from the side opposite that of FIG. 6. 

The ornamental design for a furnace combustion chamber, as shown. 